Carbureter.



0. B. IVIONOSIVIITH.

CARBURETER.

APPLICATION FILED FEB. I6. 1917.

I Patented June 25, 1918.

OLNEY JB. MONQSMITH, 01F LORAIN, OHIO.

.CARIBURETEJR.

Specification of Letters Patent.

Patented June 25, rate.

Application filed February 16, 1917. Serial No. H8344.

To all whom. it may concern Be it known that I, OLNEY MoNosMrrH, acitizen of the United States, residing at Lorain, in the county ofLorain and State of Ohio, have invented certain new and usefulImprovements in-Carbureters, of which the following is a specification.

This invention relates to carbureters for internal-combustion enginesused for propelling automobiles, and has for its principal object toprovide a carbureter of simple construction, in which the fuel controlvalve is so connected to the throttle valve that the opening of theformer will permit the independent opening of the latter by the suctionof the engine to a corres onding position, but the throttle valve wi 1be closed by the closing action of the fuel control valve. By thisarrangement, the driver operates the fuel control valve, and thethrottle valve is automatically operated in a corresponding degree toproduce the proper mixture under varying conditions. In order that thethrottle valve may be opened by the suction of the engine, it isdecentered, thereby having one wing longer than its other. Under certainconditions it is desirable that the throttle valve should not bepermitted to open too soon, and for this purpose, means are provided forre ulating the tension of a spring, which is a apted to hold the valvein closed position.

For a clear understanding of the invention, reference will be had to theaccompanying drawings, and the same will be hereinafter fully described,the novel features thereof being distinctly pointed out in the appendedclaims. I

In the drawings corresponding parts are designated by the same referencecharacters.

Figure 1 is a side elevation of a carbureter showing the mechanismconnecting the fuel control valve and the throttle valve.

Fig. 2 is a View looking at theother side and showing the means foradjusting the tension of the throttle valve spring,

Fig. 3 is a section of the carbureter' Fig. 4 is a plan sectional viewtaken on line 44 of Fig. 3, and

Fig. 5 is a perspective view of the throttle valve arm.

Referring to the drawings, 1 represents the air tube which is connected'to the engine in the usual manner by a flange 2 at its upper end. Afloat chamber 3 1s fixed and the suction of the to the side of the airtube, and between the flange 4 of the same and the air tube is ar rangeda sheet of copper or other suitable packing indicated by 5. The sheet ofcopper is provided with a vertical slot for forming a conduit 6, whichconnects an inlet opening 7 leading from the float chamber and an outletaperture 8 extending to the inner surface of the air tube.

A fuel control valve 9, is rotatably mounted in a horizontal recess 10,which is provided in the float chamber and intersects the inlet opening7. The fuel control valve is preferably made tapering to prevent leakingaround the outer end, and its beveled endll is adapted to regulate theamount of fuel admitted through the inlet opening 7 and thence to theair tube by .way of the outlet aperture 8. A throttle valve 12 isarranged within the air tube, andwhen in closed position stands at anangle with its edge covering the outlet aperture 8. This valve is fixedto the underside of a horizontal shaft 13, which is positioned a littleto one side of the center of the valve and its reduced ends 14 and 15are pivoted in bosses 16 and 17 projecting from the sides of the airtube. Said. shaft is arranged just far enough from the center of thevalve to bring it when fully open to the center of the air tube. As thethrottle valve is decentered, one side thereof is larger than the other,engine will act upon the larger side thereby forcing it open to admitair. At the same time, the outlet aperture 8 will be uncovered.

The mechanism connecting the fuel control valve 9 to the throttle valve12, and the means for regulating the tension of the spring tending tohold the throttle valve in closed position, will now be described. Tothe projecting end of the fuel control valve is fixed a lever 18, and toits upper free end is pivoted an operating rod 19, which is adapted tobe actuated longitudinally by the driver. A suitable flat spring 20,wh1ch is fastened to the bottom of the float chamber 3, engages the endof the fuel control valve for holding it in place. Pivoted to the lever18 is a link 21, and the other end of this link is pivotally connectedto an arm 22, which is rotatably mounted on a neck 23 of the boss 16.From said arm projects a lug 2' 1, whichis adapted to engage a pin 25carried, by the reduced end 14 of the throttle valve shaft, for closingthe valve, or be engaged by the, in for llmiting the opening movement "othe valve. Although the reater weight of the. larger side of .thetirottle valve 12 tends to keep it in closed position, it is anadvantage to have a more positive means, and furthermore be able toadjust said means for varying conditions. This is accomplished by fixinga depending arm 26 to the other reduced end 15 of the throttle valveshaft, and connecting the free end thereof by means of a coiled spring27 to a lever arm 28, which is pivoted at 29 to.a bracket 30 extendingfrom the air tube. To the upper end of said lever arm is pivotallyconnected an operating rod 31, which is also adapted to be manipulatedby the driver for increasing or decreasing the tension of the coiledspring 27. The tension of said spring controls the freedom of action ofthe valve.

Operation: In starting the engine, the operating rod 19 is moved in thedirection of the arrow to open the fuel control valve and thereby admitgasolene by way of the conduit 6 to the outlet aperture 8. As the arm22-is rotatably mounted upon the neck 23 of the boss 16, and the lug 24carried by this arm is above the pin 25, the opening of the fuel controlvalve will cause said arm tomove to the left, thus throwing the lug outof engagement with the pin. No action being imparted to the throttlevalve, it remains closed. The fuel control valve being open and thethrottle valve being closed, a very rich mixture is produced by slowlyturning the engine for starting. .As soon as the engine begins running,the throttle valve opens,.due to the inrushing air, until the pin 25strikes the lug 24. This limits the open ing movement of thethrottlevalve to a position corresponding to that of the fuel control valve,thus automatically producinga correct mixture. A further opening of thefuel control valve causes a momentary enriching of the mixture, and thustakes place throughout the Whole opening action. In closing the fuelcontrol valve, the lug 24, by engaging the pin 25, forces the throttlevalve to its closed position, and thus both valves are closing at thesame time'in'a corresponding degree for maintainingthe correct mixture.When it is desirable to prevent the throttle valve being opened tooreadily by the in-- rushing air or allow it to open more easily, thetension of the spring 27 may be increased or decreased by manipulatingthe operating rod 31.

closing the latter with the closing of the former, substantially asdescribed.

2. In a carbureter, the combination of an air tube, a fuel chamber, aconduit leading from the fuel chamber to the air tube, a fuel controlvalve in the conduit, a butterfly valve in the air tube, the butterflyvalve having one edge covering the outlet of the conduit when in closedposition, and mechanism for Openingthe fuel control valve and permittingthe opening of the butterfly valve and closing the latter with theclosing of the former, substantially as described.

3. In a carbureter, the combination of an air tube, a fuel chamber, avalve for controlling the flow of fuel from the chamber to the air tube,a butterfly valve in the air tube, the butterfly valve being fixed to ashaft, a lever for operating the fuel control valve, a pivotall-ysupported arm actuated by the lever, the arm carrying a lug, and the lugbeing adapted to cooperate with the shaft of the butterfly valve topermit the butterfly valve to open when the fuel control valve is openedbut to close it when the fuel control valve is closed, substantially asdescribed.

4. In a carbureter, the combination of an air tube, a fuel chamber, avalve for controlling the flow of fuel from the chamber to the air tube,a butterfly valve in the air tube, the butterfly valve being fixed to ashaft, the shaft being pivotedv in bosses of the air tube, a lever foroperating the fuel control valve, an arm pivotall supported upon a bossof the air tube, a link connectin the arm to said lever, a pin fixed insaid shaft, and a lug carried by said arm for cooperating with the pinto limit the opening of the butterfly valve when the fuel controldescribed.

In testimony whereof I afiix my signature.

OLNEY B. MONOSMITH.

